|
Charleston Mountain Draba
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arctic whitlowgrass
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| Perennials; caudex simple or branched (not fleshy, usually with some persistent leaf remains); sometimes scapose. |
Perennials; (cespitose, not pulvinate); caudex simple or branched; rarely scapose. |
unbranched, (0.1–)0.3–0.9 dm, glabrous throughout or sparsely pubescent proximally, trichomes simple and 2–6-rayed, 0.1–0.5 mm. |
unbranched, 0.3–1.7(–2.4) dm, pubescent, trichomes 4–10-rayed (rays sometimes branched), 0.1–0.3 mm, with fewer, simple ones, to 0.7 mm. |
rosulate; petiolate; petiole (0–0.5 cm), ciliate throughout; blade oblanceolate to obovate, 0.4–1.7(–2.3) cm × 1.6–4(–6) mm, margins usually entire, rarely denticulate, (sparsely ciliate, trichomes simple, 0.3–0.8 mm), surfaces pubescent, abaxially with stalked, (2–)4(–6)-rayed trichomes, (0.05–)0.1–0.6 mm, adaxially with simple and fewer, stalked, 2–4-rayed ones. |
rosulate; petiolate; petiole base ciliate, (trichomes simple, 0.2–0.8 mm); blade oblanceolate to narrowly obovate, 0.4–2.3(–3) cm × 1.5–6.5 mm, margins usually entire, rarely with 1 tooth on each side, surfaces densely pubescent with minutely stalked, 8–12-rayed, stellate trichomes, 0.2–0.4 mm, sometimes with coarser, simple or 2-rayed ones, (midvein distinct abaxially). |
0 or 1; sessile; blade ovate to lanceolate, margins entire, surfaces pubescent as basal. |
0 or 1(–3); sessile; blade ovate or oblong to lanceolate, margins entire, surfaces pubescent as basal. |
(2–)4–9(–12)-flowered, ebracteate, elongated in fruit; rachis slightly flexuous, glabrous. |
3–18(–25)-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem. |
sepals ovate, 1.2–1.7 mm, pubescent, (trichomes simple and short-stalked, 2- or 3-rayed); petals yellowish (quickly fading white), spatulate, 1.8–2.2 × 0.6–1 mm; anthers ovate, 0.25–0.3 mm. |
sepals ovate, 2–2.5 mm, pubescent, (trichomes short-stalked, 2- or 3-rayed, and simple); petals white, spatulate to obovate, 3.5–6 × 1.8–2 mm; anthers ovate, 0.3–0.4 mm. |
divaricate-ascending, straight, 2–5(–8) mm, glabrous. |
divaricate-ascending or ascending, straight, (1.5–)2–6 mm, pubescent, trichomes stalked, stellate, and, sometimes, simple. |
elliptic to linear lanceolate, plane, flattened, 5–10(–12) × 1.7–2(–2.5) mm; valves glabrous; ovules 20–30 per ovary; style 0.08–0.2 mm. |
oblong to lanceolate, plane, slightly flattened, (5–)6–11 × 2–3 mm; valves pubescent, trichomes short-stalked, 2–5-rayed (some rays branched), 0.05–0.3 mm; ovules 20–32 per ovary; style 0.1–1 mm (stigma distinctly wider than style). |
oblong, 0.9–1.2 × 0.5–0.8 mm. |
ovoid, 0.8–1.1 × (0.6–)0.7–0.8 mm. |
= 40. |
= 80. |
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| Flowering Jun–Jul. |
Flowering Jun–Jul. |
| Moist, shaded slopes among limestone and dolomite rocks |
Clay flats, gravel, beaches, limestone outcrops, talus |
| 2600-3500 m (8500-11500 ft) |
0-500 m (0-1600 ft) |
|
NV |
NU; Greenland; Europe (Norway [Svalbard]) |
Of conservation concern. Draba paucifructa is known from the Charleston Mountains in Clark County. M. D. Windham (2004) suggested that it is an allopolyploid resulting from hybridization between D. albertina and D. lonchocarpa, and he discussed the morphological features that distinguish this species from its putative parents. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
As circumscribed here, Draba arctica consists of two distinct elements often recognized as subspecies (arctica and ostenfeldii; T. W. Böcher 1966); perhaps they are better treated as distinct species (D. arctica and D. ovibovina). Lack of adequate material and inability to examine all of the types in this complex prevent us from doing so. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
| FNA vol. 7, p. 327. |
FNA vol. 7, p. 291. |
| Brassicaceae > tribe Arabideae > Draba |
Brassicaceae > tribe Arabideae > Draba |
D. abajoensis, D. albertina, D. aleutica, D. alpina, D. aprica, D. arabisans, D. arctica, D. arctogena, D. argyrea, D. arida, D. asprella, D. asterophora, D. aurea, D. aureola, D. bifurcata, D. borealis, D. brachycarpa, D. brachystylis, D. breweri, D. burkei, D. californica, D. cana, D. carnosula, D. chamissonis, D. cinerea, D. corrugata, D. corymbosa, D. crassa, D. crassifolia, D. cruciata, D. cuneifolia, D. cusickii, D. cyclomorpha, D. daviesiae, D. densifolia, D. exunguiculata, D. fladnizensis, D. glabella, D. globosa, D. graminea, D. grandis, D. grayana, D. heilii, D. helleriana, D. hitchcockii, D. howellii, D. incana, D. incerta, D. incrassata, D. inexpectata, D. jaegeri, D. juvenilis, D. kassii, D. kluanei, D. lactea, D. lemmonii, D. lonchocarpa, D. longisquamosa, D. macounii, D. maguirei, D. malpighiacea, D. micropetala, D. mogollonica, D. monoensis, D. mulliganii, D. murrayi, D. nemorosa, D. nivalis, D. norvegica, D. novolympica, D. oblongata, D. ogilviensis, D. oligosperma, D. oreibata, D. oxycarpa, D. palanderiana, D. pauciflora, D. paysonii, D. pectinipila, D. pedicellata, D. pennellii, D. petrophila, D. pilosa, D. platycarpa, D. porsildii, D. praealta, D. pterosperma, D. ramosissima, D. ramulosa, D. rectifructa, D. reptans, D. ruaxes, D. santaquinensis, D. saxosa, D. scotteri, D. serpentina, D. sharsmithii, D. sibirica, D. sierrae, D. simmonsii, D. smithii, D. sobolifera, D. spectabilis, D. sphaerocarpa, D. sphaeroides, D. standleyi, D. stenoloba, D. stenopetala, D. streptobrachia, D. streptocarpa, D. subalpina, D. subcapitata, D. subumbellata, D. trichocarpa, D. ventosa, D. verna, D. viridis, D. weberi, D. yukonensis, D. zionensis |
D. abajoensis, D. albertina, D. aleutica, D. alpina, D. aprica, D. arabisans, D. arctogena, D. argyrea, D. arida, D. asprella, D. asterophora, D. aurea, D. aureola, D. bifurcata, D. borealis, D. brachycarpa, D. brachystylis, D. breweri, D. burkei, D. californica, D. cana, D. carnosula, D. chamissonis, D. cinerea, D. corrugata, D. corymbosa, D. crassa, D. crassifolia, D. cruciata, D. cuneifolia, D. cusickii, D. cyclomorpha, D. daviesiae, D. densifolia, D. exunguiculata, D. fladnizensis, D. glabella, D. globosa, D. graminea, D. grandis, D. grayana, D. heilii, D. helleriana, D. hitchcockii, D. howellii, D. incana, D. incerta, D. incrassata, D. inexpectata, D. jaegeri, D. juvenilis, D. kassii, D. kluanei, D. lactea, D. lemmonii, D. lonchocarpa, D. longisquamosa, D. macounii, D. maguirei, D. malpighiacea, D. micropetala, D. mogollonica, D. monoensis, D. mulliganii, D. murrayi, D. nemorosa, D. nivalis, D. norvegica, D. novolympica, D. oblongata, D. ogilviensis, D. oligosperma, D. oreibata, D. oxycarpa, D. palanderiana, D. pauciflora, D. paucifructa, D. paysonii, D. pectinipila, D. pedicellata, D. pennellii, D. petrophila, D. pilosa, D. platycarpa, D. porsildii, D. praealta, D. pterosperma, D. ramosissima, D. ramulosa, D. rectifructa, D. reptans, D. ruaxes, D. santaquinensis, D. saxosa, D. scotteri, D. serpentina, D. sharsmithii, D. sibirica, D. sierrae, D. simmonsii, D. smithii, D. sobolifera, D. spectabilis, D. sphaerocarpa, D. sphaeroides, D. standleyi, D. stenoloba, D. stenopetala, D. streptobrachia, D. streptocarpa, D. subalpina, D. subcapitata, D. subumbellata, D. trichocarpa, D. ventosa, D. verna, D. viridis, D. weberi, D. yukonensis, D. zionensis |
|
D. arctica subsp. ostenfeldii, D. arctica var. ostenfeldii, D. cinerea var. arctica, D. ostenfeldii, D. ostenfeldii var. ovibovina, D. ovibovina |
| Clokey & C. L. Hitchcock: Madroño 5: 127. (1939) |
J. Vahl: in G. C. Oeder et al., Fl. Dan. 13(39): plate 5, 2294. (1840) |
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